A+3(a−1)=3(2+1) what is a

a=3

Step-by-step explanation:

3×2=6

3×1=3

3×a=3a

3× -1=-3

3a+a+ -3=4a-3

4a-3=6+3

+3 +3

4a=12

÷4 ÷4

a=3

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.

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so

step-by-step explanation:

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